v0.1.0

First release.

Added

• zap scan: list a repository's worktrees, or every repository's with --all, with
  status (merged, empty, gone, missing, active), agent, size, dependencies, age and
  last activity. --json for scripts and agents.
• Merge detection for fast-forward, merge-commit, squash and rebase merges, deleted
  upstreams, and, with --gh, pull requests merged on GitHub at the branch tip.
• zap explain PATH: every check and safety gate behind a worktree's status.
• zap init, zap clean: remove merged, empty and missing worktrees of repositories
  that opted in with a .zap file, after a one-time disclaimer and a confirmation.
  --dry-run, --yes, --all, --fetch, --unlock-stale.
• Safety gates: main and protected branches, locks, uncommitted or hidden changes,
  ignored secrets (keep_ignored), min_age, processes working in the worktree, and
  the current directory. Everything is re-checked right before removal.
• Backups of every deleted branch under refs/zap/backup/, zap history and
  zap undo.
• zap with no command: an interactive picker.
• Opt-in idle rule, offered in the picker only.
• zap roots to choose where --all looks.